Description: A control to draw a pie chart and an instance
The steps are as follows:
1. Use the MS Visual c ++ dialog editor to place the custom control into the dialog box and enter PIE_CHART_CTRL as the class name.
2. Add cpiechartctrl-class members to the header file
# include "PieChartCtrl. H"
...
CPieChartCtrl m_wndChart
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